Make WebVTTParser::collectTimeStamp static

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 2012, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 773 matching lines @@
 
     bool isPastNode = true;
     double currentTimestamp = previousTimestamp;
     if (currentTimestamp > movieTime)
         isPastNode = false;
 
     for (Node* child = root->firstChild(); child; child = NodeTraversal::next(child, root)) {
         if (child->nodeName() == timestampTag) {
             unsigned position = 0;
             String timestamp = child->nodeValue();
-            double currentTimestamp = WebVTTParser::create(0, document())->collectTimeStamp(timestamp, &position);
+            double currentTimestamp = WebVTTParser::collectTimeStamp(timestamp, &position);
             ASSERT(currentTimestamp != -1);
 
             if (currentTimestamp > movieTime)
                 isPastNode = false;
         }
 
         if (child->isWebVTTElement()) {
             toWebVTTElement(child)->setIsPastNode(isPastNode);
             // Make an elemenet id match a cue id for style matching purposes.
             if (!m_id.isEmpty())
@@ skipping 422 matching lines @@
         return false;
     if (m_cueSize != cue.size())
         return false;
     if (align() != cue.align())
         return false;
 
     return true;
 }
 
 } // namespace WebCore